![]() ![]() In this tutorial we will not use these features explicitly, but you can use them yourself when it is helpful. (For more internal commands, type \? at the psql prompt.) The full capabilities of psql are documented in psql. For example, you can get help on the syntax of various PostgreSQL SQL commands by typing: mydb=> \hĪnd psql will quit and return you to your command shell. Then you can use the same method to write your own sql function. They begin with the backslash character, “ \”. You can try to trace in the PostgreSQL log file what pgdump -table table -schema-only really does. The psql program has a number of internal commands that are not SQL commands. Try out these commands: mydb=> SELECT version() The last line printed out by psql is the prompt, and it indicates that psql is listening to you and that you can type SQL queries into a work space maintained by psql. The diagnostics of createdb and psql are similar, and if the former worked the latter should work as well. If you encounter problems starting psql then go back to the previous section. For the purposes of this tutorial that is not important. Being a superuser means that you are not subject to access controls. That would mean you are a database superuser, which is most likely the case if you installed the PostgreSQL instance yourself. In psql, you will be greeted with the following message: You already discovered this scheme in the previous section using createdb. ![]() If you do not supply the database name then it will default to your user account name. It can be activated for the mydb database by typing the command: $ psql mydb You probably want to start up psql to try the examples in this tutorial. These possibilities are discussed further in Part IV. Writing a custom application, using one of the several available language bindings. These possibilities are not covered in this tutorial. Using an existing graphical frontend tool like pgAdmin or an office suite with ODBC or JDBC support to create and manipulate a database. Running the PostgreSQL interactive terminal program, called psql, which allows you to interactively enter, edit, and execute SQL commands. ![]()
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